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The Interlocutory Injunction Test in Australia — Beecham and O’Neill

The Australian test for an interlocutory injunction comes from Beecham Group Ltd v Bristol Laboratories Pty Ltd (1968) 118 CLR 618. The court asks two questions: whether the plaintiff has made out a prima facie case, and whether the balance of convenience favours the grant of the injunction.

In Australian Broadcasting Corporation v O’Neill (2006) 227 CLR 57, the High Court reaffirmed Beecham and explained what “prima facie case” means: not that the plaintiff is more probable than not to succeed at trial, but that there is a sufficient likelihood of success to justify, in the circumstances, the preservation of the status quo pending the trial.

The two inquiries

  • Prima facie case: a sufficient likelihood of success at trial to justify preserving the status quo. How strong the probability needs to be depends on the nature of the rights asserted and the practical consequences of the injunction (O’Neill at [65]–[72] per Gummow and Hayne JJ).
  • Balance of convenience: whether the inconvenience or injury the plaintiff would be likely to suffer if the injunction were refused outweighs the injury the defendant would suffer if it were granted.

Related requirements in practice

  • Adequacy of damages: an injunction will ordinarily be refused if damages would be an adequate remedy.
  • The usual undertaking as to damages is the price of interlocutory relief.
  • In defamation, the caution against restraining publication before trial is at its strongest — the free-speech considerations discussed in O’Neill itself.

Beecham and American Cyanamid

Beecham predates the English decision in American Cyanamid v Ethicon, which speaks of a “serious question to be tried”. O’Neill made clear that in Australia the organising principles remain those in Beecham, with “serious question” understood as conveying the same idea as Beecham’s “prima facie case” properly understood — not a lower threshold detached from the context of the particular case.

Key authorities

Related doctrine guides

This guide was generated by Barrister AI from the primary authorities linked above. It is general information, not legal advice — verify every proposition against the linked judgments before relying on it. Open any case above to read the judgment, or try Barrister AI free to research across the full knowledge graph of Australian legal principles.